Plasma 6 changed the way scrollbars work for some reason. Now when you click somewhere with mouse1 the elevator jums there and the window content scrolls accordingly.
Previously, it would scroll by one window's worth in the appropriate direction. If you wanted to jump to a given location, you just used mouse2 (typically the scroll wheel button nowadays). It has worked that way everywhere for literally decades.
After reading the very weird explanation for the change, I can only conclude that the devs don't even know how to use their interface.
Hence my question, is there a setting somewhere to switch back to the traditional behaviour?
There are so many old and good UI traditions that are being broken lately, especially by Gnome, Windows and Apple, but even KDE are doing some of the things. It's extremely frustrating and I don't even want to know what a pain it'll be for me to use computers 15 years from now. I can only hope KDE will keep the old stuff as options, but future, younger devs probably won't think it's necessary because it's so alien to them.
I was literally dragging it this whole time because I didn't know they added this feature. This way is how I'm use to it working, but I'm glad there is an option for you to revert it.